Fire Announcement Systems can be classified into two parts·
      
Conventional fire announcement systems        
Addressed fire announcement systems

The main principle in both systems, fire is warned at the main panel by means of detectors. 

System has three functions:

Fire warning

Direction of authorized officials (Fire department, police, firm owner etc…)

Activating Extinguishing System (if applicable)

Fundamental Products Used in the Systems

Smoke Detector 

It is the device detecting the smoke occurred at the start of fire. It detects smoke optically. Effective detection area is between 50 m2 and 80 m2.

Thermal Detector

It is the device detecting high heat increase at the start of fire. Effective detection area is between 50 m2 and 80 m2.

Beam Type Smoke detector

It is a device detecting smoke level within the beam line. Effective detection area is between 16 X 100 m2 = 1600 m2.

Fire Alarm Buttons

It is break-push type button activated manually.

Fire siren

Device warning with voice and flash.